We don't loathe Jetstar. We just don't understand why many of their pilots are reluctant to make eye contact or return a greeting. More likely to have a chin wag with VOZ pilots these days.
The real answer to your question is probably the same as to why are some Jetstar pilots so pathologically excited over the potential demise of Qantas mainline pilots and their terms and conditions. Answer: because their are idiots in all walks of life.